integrated_traffic/src/main/java/com/zcloud/util/ObjectExcelRead.java

package com.zcloud.util;

import com.zcloud.entity.PageData;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import java.io.File;
import java.io.FileInputStream;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;


/**
 * 说明：从EXCEL导入到系统


 */
public class ObjectExcelRead {

	/**
	 * @param filepath //文件路径
	 * @param filename //文件名
	 * @param startrow //开始行号
	 * @param startcol //开始列号
	 * @param sheetnum //sheet
	 * @return list
	 */
	public static List<Object> readExcel(File target, int startrow, int startcol, int sheetnum) {
		List<Object> varList = new ArrayList<Object>();

		try {
			FileInputStream fi = new FileInputStream(target);
			HSSFWorkbook wb = new HSSFWorkbook(fi);
			HSSFSheet sheet = wb.getSheetAt(sheetnum); 					//sheet 从0开始
			int rowNum = getExcelRealRow(sheet) ; 	 					//取得最后一行的行号

			for (int i = startrow; i <= rowNum; i++) {					//行循环开始

				PageData varpd = new PageData();
				HSSFRow row = sheet.getRow(i); 							//行
				int cellNum = row.getLastCellNum(); 					//每行的最后一个单元格位置

				for (int j = startcol; j < cellNum; j++) {				//列循环开始

					HSSFCell cell = row.getCell(Short.parseShort(j + ""));
					String cellValue = null;
					if (null != cell) {
						switch (cell.getCellType().getCode()) { 					// 判断excel单元格内容的格式，并对其进行转换，以便插入数据库
							case 0:
								BigDecimal bigDecimal = new BigDecimal(cell.getNumericCellValue());
								cellValue = bigDecimal.toPlainString();
//							cellValue = String.valueOf((int) cell.getNumericCellValue());
								break;
							case 1:
								cellValue = cell.getStringCellValue();
								break;
							case 2:
								cellValue = cell.getNumericCellValue() + "";
								// cellValue = String.valueOf(cell.getDateCellValue());
								break;
							case 3:
								cellValue = "";
								break;
							case 4:
								cellValue = String.valueOf(cell.getBooleanCellValue());
								break;
							case 5:
								cellValue = String.valueOf(cell.getErrorCellValue());
								break;
						}
					} else {
						cellValue = "";
					}

					varpd.put("var"+j, cellValue);

				}
				varList.add(varpd);
			}

		} catch (Exception e) {
			System.out.println(e);
		}

		return varList;
	}

	/**
	 * 获取excel表格的真实行数
	 * @param sheet excel文件的工作簿的名称
	 * @return
	 */
	public static int getExcelRealRow(HSSFSheet sheet) {
		boolean flag = false;
		int rowCount = 0;
		for (int i = 1; i <= sheet.getLastRowNum(); i++) {
			HSSFRow row = sheet.getRow(i); 							//行
			HSSFCell cell = row.getCell(0);
			if(null != cell){
				rowCount ++;
				continue;
			}else{
				break;
			}

		}
		return rowCount;
	}
}